﻿/*
    Copyright 2016 (C) Alexey Dynda

    This file is part of Tiny Protocol Library.

    Protocol Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Protocol Library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with Protocol Library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "tkc/crc.h"

/*
 * The FCS-16 generator polynomial: x**0 + x**5 + x**12 + x**16.
 */

/*
 * FCS lookup table as calculated by the table generator.
 */

#ifdef CONFIG_ENABLE_FCS16

static uint16_t fcstab_16[256] = {
    0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3,
    0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
    0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399,
    0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
    0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42, 0x9ed9, 0x8f50,
    0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
    0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e,
    0x14a1, 0x0528, 0x37b3, 0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
    0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5,
    0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
    0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693,
    0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
    0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a,
    0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
    0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710,
    0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
    0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956, 0x78df,
    0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
    0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595,
    0xa12a, 0xb0a3, 0x8238, 0x93b1, 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
    0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c,
    0x3de3, 0x2c6a, 0x1ef1, 0x0f78};

uint16_t tk_crc16_byte(uint16_t crc, uint8_t data) {
  return (crc >> 8) ^ fcstab_16[(crc ^ (data)) & 0xff];
}

uint16_t tk_crc16(uint16_t crc, const void* data, int data_length) {
  const uint8_t* pdata = (const uint8_t*)data;

  while (data_length) {
    crc = (crc >> 8) ^ fcstab_16[(crc ^ (*pdata)) & 0xff];
    pdata++;
    data_length--;
  }

  return crc;
}

/*https://modbus.org/docs/Modbus_over_serial_line_V1_01.pdf*/
/*https://en.wikipedia.org/wiki/Modbus#Modbus_RTU_frame_format*/
/*Polynomial: x16 + x15 + x2 + 1 (CRC-16-MODBUS, normal hexadecimal algebraic polynomial being 8005 and reversed A001).*/
/*Initial value: 65,535.*/

static const uint8_t table_crc_hi[] = {
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40};

/* Table of CRC values for low-order byte */
static const uint8_t table_crc_lo[] = {
    0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04,
    0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8,
    0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
    0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3, 0x11, 0xD1, 0xD0, 0x10,
    0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4,
    0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
    0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C,
    0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26, 0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0,
    0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
    0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68,
    0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C,
    0xB4, 0x74, 0x75, 0xB5, 0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
    0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54,
    0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98,
    0x88, 0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
    0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80, 0x40};

uint16_t tk_crc16_modbus(const void* data, uint32_t len) {
  unsigned int i = 0;
  uint8_t crc_hi = 0xFF;
  uint8_t crc_lo = 0xFF;
  const uint8_t* pdata = (const uint8_t*)data;

  while (len--) {
    i = crc_lo ^ *pdata++;
    crc_lo = crc_hi ^ table_crc_hi[i];
    crc_hi = table_crc_lo[i];
  }

  return (crc_hi << 8 | crc_lo);
}

#endif

#ifdef CONFIG_ENABLE_CHECKSUM

uint16_t tk_chksum_byte(uint16_t sum, uint8_t data) {
  return sum + data;
}

uint16_t tk_chksum(uint16_t sum, const void* data, int data_length) {
  const uint8_t* pdata = (const uint8_t*)data;

  while (data_length) {
    sum = sum + *pdata;
    pdata++;
    data_length--;
  }

  return 0xFFFF - sum;
}

#endif

#ifdef CONFIG_ENABLE_FCS32
/*
 * Library: libcrc
 * File:    src/crc32.c
 * Author:  Lammert Bies
 *
 * This file is licensed under the MIT License as stated below
 *
 * Copyright (c) 1999-2016 Lammert Bies
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Description
 * -----------
 * The source file src/crc32.c contains the routines which are needed to
 * calculate a 32 bit CRC value of a sequence of bytes.
 */

static const uint32_t crc_tab32[] = {
    0x00000000ul, 0x77073096ul, 0xEE0E612Cul, 0x990951BAul, 0x076DC419ul, 0x706AF48Ful,
    0xE963A535ul, 0x9E6495A3ul, 0x0EDB8832ul, 0x79DCB8A4ul, 0xE0D5E91Eul, 0x97D2D988ul,
    0x09B64C2Bul, 0x7EB17CBDul, 0xE7B82D07ul, 0x90BF1D91ul, 0x1DB71064ul, 0x6AB020F2ul,
    0xF3B97148ul, 0x84BE41DEul, 0x1ADAD47Dul, 0x6DDDE4EBul, 0xF4D4B551ul, 0x83D385C7ul,
    0x136C9856ul, 0x646BA8C0ul, 0xFD62F97Aul, 0x8A65C9ECul, 0x14015C4Ful, 0x63066CD9ul,
    0xFA0F3D63ul, 0x8D080DF5ul, 0x3B6E20C8ul, 0x4C69105Eul, 0xD56041E4ul, 0xA2677172ul,
    0x3C03E4D1ul, 0x4B04D447ul, 0xD20D85FDul, 0xA50AB56Bul, 0x35B5A8FAul, 0x42B2986Cul,
    0xDBBBC9D6ul, 0xACBCF940ul, 0x32D86CE3ul, 0x45DF5C75ul, 0xDCD60DCFul, 0xABD13D59ul,
    0x26D930ACul, 0x51DE003Aul, 0xC8D75180ul, 0xBFD06116ul, 0x21B4F4B5ul, 0x56B3C423ul,
    0xCFBA9599ul, 0xB8BDA50Ful, 0x2802B89Eul, 0x5F058808ul, 0xC60CD9B2ul, 0xB10BE924ul,
    0x2F6F7C87ul, 0x58684C11ul, 0xC1611DABul, 0xB6662D3Dul, 0x76DC4190ul, 0x01DB7106ul,
    0x98D220BCul, 0xEFD5102Aul, 0x71B18589ul, 0x06B6B51Ful, 0x9FBFE4A5ul, 0xE8B8D433ul,
    0x7807C9A2ul, 0x0F00F934ul, 0x9609A88Eul, 0xE10E9818ul, 0x7F6A0DBBul, 0x086D3D2Dul,
    0x91646C97ul, 0xE6635C01ul, 0x6B6B51F4ul, 0x1C6C6162ul, 0x856530D8ul, 0xF262004Eul,
    0x6C0695EDul, 0x1B01A57Bul, 0x8208F4C1ul, 0xF50FC457ul, 0x65B0D9C6ul, 0x12B7E950ul,
    0x8BBEB8EAul, 0xFCB9887Cul, 0x62DD1DDFul, 0x15DA2D49ul, 0x8CD37CF3ul, 0xFBD44C65ul,
    0x4DB26158ul, 0x3AB551CEul, 0xA3BC0074ul, 0xD4BB30E2ul, 0x4ADFA541ul, 0x3DD895D7ul,
    0xA4D1C46Dul, 0xD3D6F4FBul, 0x4369E96Aul, 0x346ED9FCul, 0xAD678846ul, 0xDA60B8D0ul,
    0x44042D73ul, 0x33031DE5ul, 0xAA0A4C5Ful, 0xDD0D7CC9ul, 0x5005713Cul, 0x270241AAul,
    0xBE0B1010ul, 0xC90C2086ul, 0x5768B525ul, 0x206F85B3ul, 0xB966D409ul, 0xCE61E49Ful,
    0x5EDEF90Eul, 0x29D9C998ul, 0xB0D09822ul, 0xC7D7A8B4ul, 0x59B33D17ul, 0x2EB40D81ul,
    0xB7BD5C3Bul, 0xC0BA6CADul, 0xEDB88320ul, 0x9ABFB3B6ul, 0x03B6E20Cul, 0x74B1D29Aul,
    0xEAD54739ul, 0x9DD277AFul, 0x04DB2615ul, 0x73DC1683ul, 0xE3630B12ul, 0x94643B84ul,
    0x0D6D6A3Eul, 0x7A6A5AA8ul, 0xE40ECF0Bul, 0x9309FF9Dul, 0x0A00AE27ul, 0x7D079EB1ul,
    0xF00F9344ul, 0x8708A3D2ul, 0x1E01F268ul, 0x6906C2FEul, 0xF762575Dul, 0x806567CBul,
    0x196C3671ul, 0x6E6B06E7ul, 0xFED41B76ul, 0x89D32BE0ul, 0x10DA7A5Aul, 0x67DD4ACCul,
    0xF9B9DF6Ful, 0x8EBEEFF9ul, 0x17B7BE43ul, 0x60B08ED5ul, 0xD6D6A3E8ul, 0xA1D1937Eul,
    0x38D8C2C4ul, 0x4FDFF252ul, 0xD1BB67F1ul, 0xA6BC5767ul, 0x3FB506DDul, 0x48B2364Bul,
    0xD80D2BDAul, 0xAF0A1B4Cul, 0x36034AF6ul, 0x41047A60ul, 0xDF60EFC3ul, 0xA867DF55ul,
    0x316E8EEFul, 0x4669BE79ul, 0xCB61B38Cul, 0xBC66831Aul, 0x256FD2A0ul, 0x5268E236ul,
    0xCC0C7795ul, 0xBB0B4703ul, 0x220216B9ul, 0x5505262Ful, 0xC5BA3BBEul, 0xB2BD0B28ul,
    0x2BB45A92ul, 0x5CB36A04ul, 0xC2D7FFA7ul, 0xB5D0CF31ul, 0x2CD99E8Bul, 0x5BDEAE1Dul,
    0x9B64C2B0ul, 0xEC63F226ul, 0x756AA39Cul, 0x026D930Aul, 0x9C0906A9ul, 0xEB0E363Ful,
    0x72076785ul, 0x05005713ul, 0x95BF4A82ul, 0xE2B87A14ul, 0x7BB12BAEul, 0x0CB61B38ul,
    0x92D28E9Bul, 0xE5D5BE0Dul, 0x7CDCEFB7ul, 0x0BDBDF21ul, 0x86D3D2D4ul, 0xF1D4E242ul,
    0x68DDB3F8ul, 0x1FDA836Eul, 0x81BE16CDul, 0xF6B9265Bul, 0x6FB077E1ul, 0x18B74777ul,
    0x88085AE6ul, 0xFF0F6A70ul, 0x66063BCAul, 0x11010B5Cul, 0x8F659EFFul, 0xF862AE69ul,
    0x616BFFD3ul, 0x166CCF45ul, 0xA00AE278ul, 0xD70DD2EEul, 0x4E048354ul, 0x3903B3C2ul,
    0xA7672661ul, 0xD06016F7ul, 0x4969474Dul, 0x3E6E77DBul, 0xAED16A4Aul, 0xD9D65ADCul,
    0x40DF0B66ul, 0x37D83BF0ul, 0xA9BCAE53ul, 0xDEBB9EC5ul, 0x47B2CF7Ful, 0x30B5FFE9ul,
    0xBDBDF21Cul, 0xCABAC28Aul, 0x53B39330ul, 0x24B4A3A6ul, 0xBAD03605ul, 0xCDD70693ul,
    0x54DE5729ul, 0x23D967BFul, 0xB3667A2Eul, 0xC4614AB8ul, 0x5D681B02ul, 0x2A6F2B94ul,
    0xB40BBE37ul, 0xC30C8EA1ul, 0x5A05DF1Bul, 0x2D02EF8Dul};

uint32_t tk_crc32(uint32_t init, const void* data, int size) {
  size_t a = 0;
  uint32_t crc = init;
  const uint8_t* ptr = (const uint8_t*)data;

  if (ptr != NULL)
    for (a = 0; a < size; a++) {
      crc = (crc >> 8) ^ crc_tab32[(crc ^ (uint32_t)*ptr++) & 0x000000FFul];
    }

  return crc;
} /* crc_32 */

uint32_t tk_crc32_byte(uint32_t crc, uint8_t data) {
  return (crc >> 8) ^ crc_tab32[(crc ^ (uint32_t)data) & 0x000000FFul];
}

#include "tkc/fs.h"
#include "tkc/mem.h"
#include "tkc/utils.h"

uint32_t tk_crc32_file(const char* filename, uint32_t block_size) {
  int32_t size = 0;
  fs_file_t* fp = NULL;
  void* buff = NULL;
  uint32_t crc32 = PPPINITFCS32;

  return_value_if_fail(filename != NULL, crc32);

  fp = fs_open_file(os_fs(), filename, "rb");
  return_value_if_fail(fp != NULL, crc32);
  block_size = tk_max_int(block_size, 256);
  block_size = tk_min_int(block_size, 1024 * 1024);

  buff = TKMEM_ALLOC(block_size + 1);
  goto_error_if_fail(buff != NULL);

  while (!fs_file_eof(fp)) {
    size = fs_file_read(fp, buff, block_size);
    if (size <= 0) {
      break;
    }
    crc32 = tk_crc32(crc32, buff, size);
  }

error:
  fs_file_close(fp);
  TKMEM_FREE(buff);

  return crc32;
}
#endif
